?Poor Quality Preview > Images

[Zardoz2293]

v28.30.0302

EDIT: Clarification-- this is regarding PDF files in the Preview Pane.

Not sure when the image degrade occurred, or if it's a defect/bug. Preview in Windows Explorer (LEFT) and XYplorer (RIGHT) -- looking for same, or near same resolution as in the LEFT within XYplorer.

PDF-XChange Editor Pro is driving the preview handler (v10.8.5, Build 410)

Screen Shot 2026-04-22 at 20.51.48.png

[admin]

Looks like XY is showing only a thumbnail, not the real preview. Maybe you ticked PDF in "Configuration | Preview | Previewed Formats | Categories | Preview as Thumbnail"? Or you unticked PDF in "Configuration | Preview | Previewed Formats | Categories | Document Files"?

[Zardoz2293]

Looks like XY is showing only a thumbnail, not the real preview. Maybe you ticked PDF in "Configuration | Preview | Previewed Formats | Categories | Preview as Thumbnail"? Or you unticked PDF in "Configuration | Preview | Previewed Formats | Categories | Document Files"?

Both are set correctly.

I've forwarded my XYplorer.ini to support.

Thank you!

[admin]

Okay, I'll look into it later.

In the meantime you could try scripting command previewcheck.

[Zardoz2293]

Okay, I'll look into it later.

In the meantime you could try scripting command previewcheck.

XYplorer 28.30.0302 - Windows 11 Pro, 64-bit, Version 25H2, Build 26200.8246 (10.0) - 2026-04-23 10:15:09
=============================================================================================================

Preview Check: \\Mac\\sample.pdf

+ n - preview loaded in 267.6 ms
- p - preview failed in 6.1 ms
- p32 - preview failed in 6.6 ms
- p64 - preview failed in 3.3 ms
+ t - preview loaded in 203.9 ms
+ tf32 - preview loaded in 203.8 ms
+ tf64 - preview loaded in 200.3 ms
- te32 - preview failed in 15.4 ms
- tg32 - preview failed in 8.2 ms

--------------------------------------------------------------------------------

PreviewEarlyFactory = 0
PreviewPSDEmbeddedThumb = 0
ThumbsRAWfiles = 1
ThumbsShell = 1
CanHaveThumb = True

+ Document Files = .afdesign.afpub.ai.cdr.cgm.rtf.doc.dot.docm.docx.dotx.xls.xlt.xlsm.xlsx.xltx.ppt.pot.pps.pptx.potx.ppsx.wpd.wpf.odt.ods.odp.one.pdf.eps.ps.jtx.xps.oxps.dwg.dwf.dwfx.dxf.easmx.edrwx.eprtx.sldprt.sldasm.slddrw.step.stp.prt.drw.eml.msg.nws.skp.layout.epub.mobi.3mf.fbx.fs.azw3.manifest.obi.plist.prf.ps1.sln.spg.user.vmxf.vmx~.vsixmanifest.vsmdi.vssettings.xaml.xmp.xrm-ms.xul. - except: .user.

- Image Files = .gif.ico.cur.emf.wmf.png.bmp.dib.rle.tga.tpic.dds.hdr.pic.pict.clip.lip.exr.heic.heif.webp.avif.afphoto.c4d.kra.xcf.xpm.pjp.pjpg.pjpeg.jp2.pdn.xbm.apng.jxl.jfif.jpg.jpeg.jpe.psb.psd.arw.cpt.cr2.crw.dcr.dng.erf.fff.mrw.mef.nef.nrw.orf.pef.raf.raw.rw2.rwl.sr2.srf.srw.x3f.tif.tiff.thm.*. - except:

- Preview as Thumbnail = .afdesign.afphoto.afpub.azw3.c4d.cb7.cbr.cbt.cbz.epub.layout.mobi.skp.sldasm.slddrw.sldprt.step.stp.xar.3mf.fbx.fs.prt.drw.webp.pdn. - except:

[Zardoz2293]

Using script code form: viewtopic.php?t=25848

Code: Select all

text "Prev. handler: " . <crlf> . get("previewhandler", "pdf") . <crlf> . "UD prev. handler(s): " . getkey("UserDefinedPreviewHandlers", "Settings") . <crlf 3> . "Associated app: " . get("assoc", "pdf");

Prev. handler:
Preview handler for pdf files
GUID: {9B68BDF7-95F9-4A1F-851C-27D822F8E3E9}
DefaultName: PDF-XChange Preview Handler
DisplayName: PDF-XChange Preview Handler
UD prev. handler(s):


Associated app: PDFXEdit.exe

[admin]

preview failed ... that explains why you see the thumbnail. Why does it fail? Can't say. Maybe the handler is not 64-bit?

[Zardoz2293]

preview failed ... that explains why you see the thumbnail. Why does it fail? Can't say. Maybe the handler is not 64-bit?

My guess is it has something to do with XYplorer being AMD64 and I'm on WinOS= AArch64, Explorer= AArch64, and PDF-XChange= AArch64

[admin]

Do you have this issue with all PDFs?

[Zardoz2293]

Do you have this issue with all PDFs?

100%

Vendor of PDF-XChange Editor is suggesting there might be an issue within XYplorer's Preview Pane's Scaling related to Screen Resolution as the Preview Handler is working correctly in Windows Explorer in the same environment.

Further clarification: I am only using XYplorer on the Main display (MacBook 4112 x 2658 @200%) - VM (Client) W11 Pro, 25H2.26200.8246 (10.0)

[admin]

Could you try the 32-bit version of XYplorer?

[Zardoz2293]

Could you try the 32-bit version of XYplorer?

32-Bit (v27.20.1217) = WORKS AS EXPECTED (PERFECT SCALING OF PREVIEW PANE)
64-Bit (v28.30.0401) = POOR QUALITY, VERY PIXELATED.

[admin]

Could you try the 64-bit handler from the 32-bit version? Check this:
Configuration | Other | Shell Integration | 64-bit Windows | Use 64-bit preview handlers for preview

[Zardoz2293]

Could you try the 64-bit handler from the 32-bit version? Check this:
Configuration | Other | Shell Integration | 64-bit Windows | Use 64-bit preview handlers for preview

Screen Shot 2026-04-25 at 10.56.38.png

Code: Select all

See the end of this message for details on invoking 
just-in-time (JIT) debugging instead of this dialog box.

************** Exception Text **************
System.FormatException: Input string was not in a correct format.
   at System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal)
   at System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info)
   at Preview64.Form1.handlePreview(String[] arguments)
   at Preview64.Form1.Form1_Load(Object sender, EventArgs e)
   at System.Windows.Forms.Form.OnLoad(EventArgs e)
   at System.Windows.Forms.Form.OnCreateControl()
   at System.Windows.Forms.Control.CreateControl(Boolean fIgnoreVisible)
   at System.Windows.Forms.Control.CreateControl()
   at System.Windows.Forms.Control.WmShowWindow(Message& m)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.Form.WmShowWindow(Message& m)
   at Preview64.Form1.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)


************** Loaded Assemblies **************
mscorlib
    Assembly Version: 4.0.0.0
    Win32 Version: 4.8.9325.0 built by: NET481REL1LAST_25H2_C
    CodeBase: file:///C:/Windows/Microsoft.NET/Framework64/v4.0.30319/mscorlib.dll
----------------------------------------
XY64
    Assembly Version: 1.0.8451.19745
    Win32 Version: 1.0.0.30
    CodeBase: file:///C:/Program%20Files%20(x86)/XYplorer/XY64.exe
----------------------------------------
System.Windows.Forms
    Assembly Version: 4.0.0.0
    Win32 Version: 4.8.9325.0 built by: NET481REL1LAST_25H2_C
    CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Windows.Forms/v4.0_4.0.0.0__b77a5c561934e089/System.Windows.Forms.dll
----------------------------------------
System
    Assembly Version: 4.0.0.0
    Win32 Version: 4.8.9333.0 built by: NET481REL1LAST_25H2_B
    CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System/v4.0_4.0.0.0__b77a5c561934e089/System.dll
----------------------------------------
System.Drawing
    Assembly Version: 4.0.0.0
    Win32 Version: 4.8.9221.0 built by: NET481REL1LAST_25H2
    CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Drawing/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll
----------------------------------------
System.Configuration
    Assembly Version: 4.0.0.0
    Win32 Version: 4.8.9221.0 built by: NET481REL1LAST_25H2
    CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Configuration/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Configuration.dll
----------------------------------------
System.Core
    Assembly Version: 4.0.0.0
    Win32 Version: 4.8.9319.0 built by: NET481REL1LAST_25H2_B
    CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Core/v4.0_4.0.0.0__b77a5c561934e089/System.Core.dll
----------------------------------------
System.Xml
    Assembly Version: 4.0.0.0
    Win32 Version: 4.8.9221.0 built by: NET481REL1LAST_25H2
    CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Xml/v4.0_4.0.0.0__b77a5c561934e089/System.Xml.dll
----------------------------------------

************** JIT Debugging **************
To enable just-in-time (JIT) debugging, the .config file for this
application or computer (machine.config) must have the
jitDebugging value set in the system.windows.forms section.
The application must also be compiled with debugging
enabled.

For example:

<configuration>
    <system.windows.forms jitDebugging="true" />
</configuration>

When JIT debugging is enabled, any unhandled exception
will be sent to the JIT debugger registered on the computer
rather than be handled by this dialog box.

AFTER the FAULT w/ 64-bit handler the preview pane is like below. Switching BACK to the 32-bit does not update, XY must be unloaded and load.

Screen Shot 2026-04-25 at 10.59.25.png

32-Bit Handler (below) in 32-Bit XYplorer.

Screen Shot 2026-04-25 at 11.00.42.png

[admin]

Something is wrong with that handler. (No idea why it works in Explorer.) Did you ever try the free PDF-XChange Viewer? It works well everywhere and always.